Photo gallery

At the hearing, Rick Birkman (left) was seated next to Demetrios Papademetriou, co-director of the Migration Policy Institute, Washington, D.C.; Charles Cervantes, general counsel for the United States-Mexico Chamber of Commerce; and Vernon Briggs, professor of industrial and labor relations at Cornell University, Ithaca, N.Y.

Photo 1: The all-copper roof system on Kresge Auditorium at the Massachusetts Institute of Technology, Boston

Photo courtesy of Donald Baerman.

Photo 2: This photo shows corrosion on a low-slope copper roof system in Westchester County, N.Y., that receives runoff from a steep-slope cedar shingle roof system. Note there is no corrosion on the low-slope copper roof system receiving runoff from the steep-slope copper roof system.

Photo courtesy of Donald Baerman.

This photo shows the copper roof system with a glass and aluminum skylight on Middlebury Elementary School, Middlebury, Conn. Note the corrosion is confined to the copper flashing under the skylight.

Photo courtesy of Donald Baerman.

This photo shows the copper roof system with a glass and aluminum skylight on Middlebury Elementary School, Middlebury, Conn. Note the corrosion is confined to the copper flashing under the skylight.

Photo courtesy of Donald Baerman.

Photo 5: This is a magnified photo of an open-front rainwater leader showing copper corrosion. Note the corrosion pits. The gold-colored areas are bare copper; black areas probably are copper oxide or copper sulfide; blue and green areas probably are copper sulfate.

Photo courtesy of Donald Baerman.

Photo 6: A built-in gutter lined with EPDM rubber

Photo courtesy of Donald Baerman.

Photo 7: A corroding copper gutter in St. John, New Brunswick

Photo courtesy of Donald Baerman.

Photo 8: There is no apparent corrosion at the gutters of the Robie House, a Frank Lloyd Wright home in Chicago.

Photo courtesy of Donald Baerman.